USGS Office of Ground Water
Revision Date: 5 March, 2007
Corrected coding forms showing data elements for county and eight-digit hydrologic unit.
For more information, please contact Susan Hutson.
Accessibility FOIA Privacy Policies and Notices
U.S. Department of the Interior | U.S. Geological Survey URL: https://pubsdata.usgs.gov/pubs/tm/2007/tm4e1/control/revisions.html Page Contact Information: Publications Team Page Last Modified: Friday, 02-Dec-2016 15:47:14 EST